JP2009166825A - Fuel leakage preventing valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel leakage preventing valve capable of completely preventing fuel leakage. <P>SOLUTION: The fuel leakage preventing valve includes: a connector 1 attached to an upper wall of a fuel tank with a connection area 5 to communicate an inner portion with an outer portion; a housing 2 having a valve seat 6 that communicates with the connection area 5 at an upper portion with a housing area partitioned in the inner portion; and a float valve 3 having a valve portion 3a that opens and closes the valve seat 6 of the housing 2 and placed in the housing area of the housing 2 so as to move in a vertical direction. The fuel leakage preventing valve further includes a through-hole 11 that communicates the inner side with the outer side on an upper portion wall surface of the housing 2 and a rectangular wall piece 16 provided in the inner side of the housing 2 corresponding to the through-hole. In addition, the float valve 3 has such a shape so as not to interfere with the wall piece 16. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a fuel leakage prevention valve that prevents fuel leakage from a fuel tank, for example, when a vehicle turns or falls.

  As shown in FIG. 11, the conventional fuel leakage prevention valve of the prior art has a connector 1 attached to the upper wall of the fuel tank with a connection space 5 communicating with the outside, and a storage space defined inside. A housing 2 having a valve seat 6 communicating with the connection space 5 at an upper portion and a valve portion 3a for opening and closing the valve seat 6 of the housing 2 are provided, and a biasing spring pressure of the spring 7 is applied in the housing space of the housing 2. The float valve 3 is disposed so as to be movable up and down while being received, and the cap 4 closes the lower opening of the housing 2 (see, for example, Patent Document 1).

  For the connector 1, an annular flange portion 8 for sealing a mounting hole formed in the upper wall of the fuel tank is formed on the outer periphery of the lower portion, and on the canister (not shown) side on the upper side. An upper small chamber portion 10A having the valve seat 6 and the upper small chamber portion 10A are connected to the housing 2 which is connected to the connector 1 via an O-ring 15 and is horizontally installed. A plurality of through holes 11 that communicate with the inner and outer sides of the uppermost wall surface of the lower large chamber portion 10B. An upper small-diameter portion 12A formed with a valve portion 3a for opening and closing the seat 6 at the tip and a lower large-diameter portion 12B that moves up and down in the lower large chamber portion 10B of the housing 2 and a conical shape of the upper small-diameter portion 12A. The first guide wall 13 protrudes from the peripheral surface At the same time, a second guide wall 14 is provided on the side surface of the lower large-diameter portion 12B, and the cap 4 is not specifically shown, but has a connecting and fixing means for the housing 2, A large number of air holes are formed in the lower wall.

  Therefore, in actual use, a state in which the connector 1 and the housing 2 are connected is obtained, and the float valve 3 and the spring 7 are housed in the housing space of the housing 2 while the lower opening of the housing 2 is covered with the cap 4. If it is closed, the fuel leakage prevention valve is assembled. Therefore, the connector 1 is connected to the flange portion 8 while the housing 2 faces the mounting hole H formed in the upper wall Ta of the fuel tank T. If it is thermally welded to the upper wall Ta of the fuel tank T, it will be used.

  12. Normally, as shown in FIG. 12, since the float valve 3 is lowered inside the housing 2, the valve seat 6 formed in the upper small chamber portion 10A of the housing 2 is opened, and the inside of the fuel tank T is opened. The gasoline vapor is discharged from the connecting pipe portion 9 of the connector 1 to the outside through a canister (not shown). Under such a condition, the fuel splash that has entered from the through hole 11 of the housing 2 due to the oscillation of the fuel is likely to be scattered in the direction of the valve seat 6 and there is a risk of fuel leakage. In this case, since the through hole 11 is provided at the uppermost position of the lower large chamber portion 10B of the housing 2, the fuel splash is blocked by a step generated at the boundary between the large chamber portion 10B and the small chamber portion 10A. There is no need to worry about leaks.

On the contrary, when the automobile turns and the fuel in the fuel tank T reaches the inside of the housing 2 through the through hole 11 of the housing 2 and the vent hole of the cap 4, the buoyancy and the biasing spring pressure of the spring 7 As shown in FIG. 13, the float valve 3 is automatically raised, and the upper small-diameter portion 12A of the float valve 3 enters the upper small chamber portion 10A of the housing 2, and the valve seat 6 on the housing 2 side by its own valve portion 3a. As a result, fuel leakage can be prevented.
Japanese Patent Laid-Open No. 2007-127017

  Therefore, in the conventional fuel leakage prevention valve, the through hole 11 is provided at the uppermost position of the lower large chamber portion 10B of the housing 2, and theoretically, the passage of the housing 2 is caused by the oscillation of the fuel. Even if the fuel enters from the hole 11 and the droplets are about to scatter in the direction of the valve seat 6, the fuel droplets are blocked by the step generated at the boundary between the large chamber portion 10B and the small chamber portion 10A. However, the fuel spray cannot be completely blocked by this alone, and at least a part of the fuel spray may be scattered in the direction of the valve seat 6 to cause fuel leakage.

  The present invention was developed in order to effectively solve the problems of such a conventional fuel leakage prevention valve. The invention according to claim 1 has a connection space communicating with the outside inside, and a fuel tank. A housing having a housing attached to an upper wall of the housing, a housing having a valve seat communicating with the connection space at an upper portion thereof, and a valve portion for opening and closing the valve seat of the housing; In the fuel leakage prevention valve comprising a float valve arranged to be movable up and down, a through hole is provided in the upper wall surface of the housing to communicate the inside and outside, and a rectangular shape is formed inside the housing corresponding to the through hole. While the wall piece is provided, the float valve has a shape that does not interfere with the wall piece.

  According to a second aspect of the present invention, on the premise of the first aspect, the rectangular wall piece has an upper edge and one side edge integrally connected to the housing.

  According to a third aspect of the present invention, on the premise of the first or second aspect, the housing has an upper small chamber portion having a valve seat and a lower large chamber portion continuous from the upper small chamber portion, and the float valve is The upper small-diameter portion that forms a valve portion for opening and closing the valve seat of the housing and the lower large-diameter portion that moves up and down in the lower large chamber portion of the housing, and the float valve descends to the upper small-diameter portion of the float valve The first guide wall portion that enters the upper small chamber portion of the housing is provided.

  According to a fourth aspect of the present invention, on the premise of the third aspect, a second guide wall portion is provided at the lower large diameter portion of the float valve, and a rectangular shape is formed between the second guide wall portion and the first guide wall portion. It is characterized by the presence of a wall piece.

  According to a fifth aspect of the present invention, on the premise of the second aspect, the fuel that has passed through the through hole of the housing is formed on the inner surface of the housing that is separated from the other side edge of the rectangular wall piece that is not connected to the housing. It is characterized by having an inner wall that collides.

  According to the sixth aspect of the present invention, on the premise of the second aspect, the fuel before passing through the through hole of the housing collides with the outer surface of the housing on one side edge side connected to the housing of the rectangular wall piece. An outer wall is provided.

  According to a seventh aspect of the present invention, on the premise of the second aspect, the fuel that has passed through the through hole of the housing is formed on the inner side surface of the housing apart from the other side edge that is not connected to the housing of the rectangular wall piece. In addition to providing an inner wall to collide with, an outer wall against which fuel before passing through the through hole of the housing collides is provided on the outer surface of the housing on one side edge side connected to the housing of the rectangular wall piece. .

  Therefore, in the invention according to claim 1, in the relationship that the wall piece is provided inside the housing corresponding to the through hole, by once hitting the fuel that has entered from the through hole of the housing against the wall piece, It takes time for the splash to scatter in the direction of the valve seat of the housing, and in the meantime, the valve seat of the housing can be closed by the valve portion of the float valve, so that fuel leakage can be prevented. Further, since the float valve itself has a shape that does not interfere with the wall piece, the presence of the wall piece does not get in the way. Furthermore, since the wall piece is provided inside the housing, there is no fear that the fuel leakage prevention valve itself is enlarged.

  In the invention according to claim 2, the fuel that has entered from the through-hole of the housing is connected to the housing in such a relationship that the upper edge and one side edge of the rectangular wall piece are integrally connected to the housing. Since it can guide to the lower edge side and the other side edge side which are not connected, it can prevent fuel leakage reliably and the wall piece itself is not easily deformed.

  In the invention according to claim 3, since the first guide wall portion is provided in the upper small diameter portion of the float valve, the backlash between the housing and the float valve can be reduced even if the float valve has a shape that does not interfere with the wall piece. It can be minimized.

  According to the fourth aspect of the present invention, rattling between the housing and the float valve can be more reliably prevented because the second guide wall portion is also provided in the lower large diameter portion of the float valve. On the contrary, if the second guide wall is provided on the housing side, the distance between the second guide wall and the through hole is narrowed, so that the exhaust performance of gasoline vapor is deteriorated, but the second guide wall is provided on the float valve side. If it is provided, it will not be affected at all.

  In the invention according to claim 5, the rectangular wall piece has passed through the through hole of the housing because the inner wall is provided on the inner side surface of the housing apart from the other side edge not connected to the housing. Since the fuel collides with the inner wall, fuel leakage can be effectively prevented in combination with the action of the wall piece.

  In the invention according to claim 6, the fuel before passing through the through hole of the housing in the relation that the outer wall is provided on the outer surface of the housing on one side edge side connected to the housing of the rectangular wall piece. Since this collides with the outer wall, the fuel leakage can be effectively prevented in combination with the action of the wall piece.

  In the invention according to claim 7, the fuel that has passed through the through hole of the housing and the fuel that has not passed through the through hole of the housing in a relationship in which both the inner wall and the outer wall are provided on the inner side surface and the outer side surface of the housing. Can be made to strike the inner wall and the outer wall at the same time, so that fuel leakage can be further prevented.

  The present invention includes a connector attached to the upper wall of the fuel tank having a connection space communicating with the outside inside, a housing having a valve seat defining a storage space inside and communicating with the connection space above, On the premise of a fuel leakage prevention valve having a valve portion that opens and closes the valve seat of the housing and is arranged to be movable up and down in the housing space of the housing, the inner and outer sides communicate with the upper wall surface of the housing. In addition, a rectangular wall piece is provided on the inner side of the housing corresponding to the through hole, and the float valve is formed in a shape that does not interfere with the wall piece, thereby reliably preventing fuel leakage. To do.

  Hereinafter, the present invention will be described in detail based on preferred embodiments illustrated in the drawings. The fuel leakage prevention valve according to the first embodiment basically has a connection space 5 that communicates with the outside as shown in FIG. 1, as in the conventional example described above. A housing 1 having a connector 1 attached to the upper wall Ta, a housing 2 that defines a storage space inside and communicates with the connection space 5 at an upper portion, and a valve portion 3a that opens and closes the valve seat 6 of the housing 2 And a float valve 3 that can be moved up and down while receiving the biasing spring pressure of the spring 7 in the housing space of the housing 2, and a cap 4 that closes the lower opening of the housing 2. ing. In addition, the same code | symbol as the code | symbol of a prior art example is attached | subjected to what is common in the components and members of a prior art example.

  In this case, for the connector 1, an annular flange portion 8 for sealing the mounting hole H formed in the upper wall Ta of the fuel tank T is formed on the outer periphery of the lower portion, and the canister side is formed on the upper side. An upper small chamber portion 10A having the valve seat 6 and the upper small chamber portion 10A are connected to the housing 2 which is connected to the connector 1 via an O-ring 15 and is horizontally installed. The lower large chamber portion 10B is continuous with the uppermost opposing wall surface of the lower large chamber portion 10B to form a three-stage through hole 11 having a paired relationship for communicating the inner and outer sides. The upper small-diameter portion 12A formed at the tip of the valve portion 3a for opening and closing the valve seat 6 of the housing 2 and the lower large-diameter portion 12B moving up and down in the lower large chamber portion 10B of the housing 2 are formed. The conical circumferential surface of the upper small diameter portion 12A A plurality of first guide wall portions 13 project at a constant interval, and a plurality of second guide wall portions 14 project at a constant interval on the side surface of the lower large diameter portion 12B. On the other hand, although not specifically shown, it has a structure for connecting and fixing the housing 2 and forming a large number of vent holes in the lower wall.

  In the first embodiment, on the premise of such a configuration, as shown in FIGS. 2 and 3, a rectangular wall piece 16 is formed inside the housing 2 facing each through hole 11 of the housing 2. Are provided individually, the fuel entering from each through-hole 11 is struck against the wall piece 16, and it takes time for the splash to scatter toward the valve seat 6 of the housing 2. The valve seat 6 of the housing 2 is closed by 3a, and thereby, the fuel leakage can be prevented. For this reason, each wall piece 16 has a relationship in which its upper edge and one side edge are integrally connected to the housing 2, and as a whole, each wall piece 16 defines a certain interval. With the covering state, it becomes a horizontal L-shape and exhibits a shape in which the surface side is curved.

  Further, as shown in FIG. 4, the float valve 3 is provided so that the float valve 3 does not interfere with the wall piece 16 during the vertical movement due to the wall piece 16 provided inside the housing 2. The height of the second guide wall portion 14 provided on the side surface of the lower large diameter portion 12B is limited, and an air space 17 is defined between the second guide wall portion 14 and the first guide wall portion 13. The structure in which each wall piece 16 exists in the air space 17 is also employed. Accordingly, the diameter connecting the wall pieces 16 is set within the range of the diameter connecting the first guide wall portions 13 and the diameter connecting the second guide wall portions 14, and the height of each wall piece 16 is There is no concern that the float valve 3 may move up and down because it stays between the first guide wall 13 and the second guide wall 14.

  Therefore, even in the fuel leakage prevention valve having such a configuration, a state in which the connector 1 and the housing 2 are connected is obtained, and the float valve 3 and the spring 7 are accommodated in the housing space of the housing 2 while the housing 1 If the lower opening of 2 is closed with the cap 4, the fuel leakage prevention valve can be easily assembled. Accordingly, the housing 2 is attached to the upper wall Ta of the fuel tank T as in the prior art. If the connector 1 is thermally welded to the upper wall Ta of the fuel tank T through the flange portion 8 while facing the H, the connector 1 is used.

  In this state, the upper small chamber portion 10A of the housing 2 corresponds to the upper small diameter portion 12A of the float valve 3, and the lower large chamber portion 10B and the lower large diameter portion 12B correspond to each other. Since the height position of the valve seat 6 of the housing 2 can be protruded to a sufficient height through the mounting hole H provided in the upper wall Ta of the fuel tank T, the fuel level when the tank is full The fuel tank T can be pulled up, and a larger amount of fuel can be accumulated in the fuel tank T.

  Since the float valve 3 is normally lowered in the housing 2, the valve seat 6 formed in the upper small chamber portion 10 </ b> A of the housing 2 is opened, and the gasoline vapor in the fuel tank T is connected to the connector 1. As a result of discharge from the connecting pipe portion 9 provided to the outside through the canister, the internal pressure of the fuel tank T can be prevented from rising abnormally.

  Further, the fuel that has entered through the through holes 11 of the housing 2 due to the oscillation of the fuel accompanying the traveling of the automobile is basically generated at the boundary between the lower large chamber portion 10B and the upper small chamber portion 10A of the housing 2. The step can prevent the splash from splashing in the direction of the valve seat 6 of the housing 2, but if this is still not sufficient, the fuel that has entered through the through-hole 11 is temporarily applied to the corresponding wall piece 16. By hitting it, it leads to the lower edge side and the other side edge side in the open state that are not connected to the housing 2, and it takes time to reach the valve seat 6, so before the fuel splashes reach the valve seat 6, As a result of the valve portion 3a formed in the upper small diameter portion 12A of the float valve 3 closing the valve seat 6 of the housing 2, it is possible to prevent fuel leakage.

  On the contrary, when the automobile turns and the fuel in the fuel tank T reaches the inside of the housing 2 through the through hole 11 of the housing 2 and the vent hole of the cap 4, the buoyancy and the biasing spring pressure of the spring 7 The float valve 3 automatically rises. At this time, the second guide wall portion 14 provided on the lower large diameter portion 12B side of the float valve 3 is formed on the inner wall surface of the lower large chamber portion 10B of the housing 2. In addition to moving along, the first guide wall portion 13 provided on the upper small diameter portion 12A side also moves along the inner wall surface of the upper small chamber portion 10A, so that the looseness of the float valve 3 at the time of ascent is minimized. Therefore, the movement of the float valve 3 can be smoothly guided. Even in this case, the fuel that has entered from the through hole 11 of the housing 2 collides with the corresponding wall piece 16 and is guided to the lower edge side and the other side edge side of the wall piece 16 that are open. Needless to say.

  Therefore, finally, the upper small diameter portion 12A of the float valve 3 enters the upper small chamber portion 10A of the housing 2, and the valve seat 6 on the housing 2 side is closed by its own valve portion 3a. Leakage can be prevented. When the automobile falls, the float valve 3 obtains the guidance of the first and second guide walls 13 and 14 by the weight of the float valve 3 itself and the biasing spring pressure of the spring 7 and operates in the same manner. Since the valve seat 6 on the housing 2 side is closed by the valve portion 3a, the fuel leakage can be prevented.

  Further, when the fuel flows from the inside of the housing 2, the float valve 3 loses buoyancy and descends inside the housing 2. At this time as well, the first guide wall portion 13 remains in the upper small chamber portion. Since the second guide wall portion 14 moves along the inner wall surface of the lower large chamber portion 10B, the movement of the float valve 3 can be smoothly guided.

  Next, the fuel leakage prevention valve according to the second embodiment will be explained. The second embodiment follows the configuration of the first embodiment as described above, but in addition to this, FIG. As shown in FIG. 2, the height and radial dimensions of the wall piece 16 are substantially equal to the inner surface of the housing 2 away from the other side edge of the rectangular wall piece 16 not connected to the housing 2. The inner walls 18 are individually provided, and the fuel that has passed through the through holes 11 of the housing 2 is made to hit the inner walls 18.

  Therefore, even in the second embodiment, if the fuel tries to enter from the through holes 11 of the housing 2 due to the oscillation of the fuel accompanying the traveling of the automobile, the fuel that has passed through the through holes 11 once corresponds. In this case, the direction in which the fuel enters is one side edge side connected to the housing 2 of each wall piece 16 as shown by the arrows in FIGS. Then, the fuel collides with the one side edge side, and most of the fuel is led to the lower edge side and the other side edge side which are not connected to the housing 2 and gain time to reach the valve seat 6, On the contrary, if the direction in which the fuel enters is the direction of the other side edge opened from one side edge connected to the housing 2 of each wall piece 16 as shown by the arrow in FIG. Because there is nothing to block, the splash of fuel is 6 valve seat There is a possibility to reach.

  However, in the second embodiment, as described above, the inner wall 18 is provided on the inner surface of the housing 2 away from the other side edge in the open state, and the fuel that has passed through the through hole 11 is supplied to the inner wall 18. Since the structure of hitting the inner wall 18 is adopted, even if fuel enters from the direction of the arrow in FIG. 10, the fuel that has entered this time hits the inner wall 18 and reaches the valve seat 6. Since this can be reliably prevented, fuel leakage can be more reliably prevented as compared with the first embodiment.

  Further, in the second embodiment, as shown in FIG. 6, a vertical and horizontal rib structure 20 is positively provided on the inner surface of the valve seat 6 of the upper small chamber portion 10A of the housing 2, for example, Even when fuel droplets are splashed on the valve seat 6, the fuel tank is hit against the rib structure 20 to make it difficult for the fuel droplets to accumulate, and a structure that provides impact resistance is also employed.

  The fuel leakage prevention valve according to the third embodiment will be described. In the third embodiment, the housing 2 of each rectangular wall piece 16 is opposite to the second embodiment described above, as shown in FIG. On the outer surface of the housing 2 on one side edge side connected to each other, an outer wall 19 that is substantially equal to the height dimension of the wall piece 16 is provided individually and passes through each through hole 11 of the housing 2. The fuel before being hit is configured to hit the outer wall 19.

  Therefore, in the third embodiment, if the fuel tries to enter from the respective through holes 11 of the housing 2 due to the oscillation of the fuel accompanying the traveling of the automobile, the fuel now passes through the respective through holes 11. Since it hits each outer wall 19 and flows down along the outer surface of the housing 2 before, the amount of fuel passing through each through-hole 11 becomes extremely small. As a result, fuel leakage can be prevented more reliably.

  Although not specifically shown, if the inner wall 18 of the second embodiment and the outer wall 19 of the third embodiment are provided on the inner and outer surfaces of the housing 2 at the same time, the fuel leakage occurs due to the synergistic action of the inner wall 18 and the outer wall 19. Can be more reliably prevented.

  Since the fuel leakage prevention valve according to the present invention is provided with a wall piece on the inner side corresponding to the through hole of the housing, it is possible to prevent the splash of fuel entering from the through hole from being immediately scattered in the valve seat direction of the housing. If this is applied to a fuel tank of an automobile, it will be very convenient.

It is a longitudinal cross-sectional view which decomposes | disassembles and shows the fuel leak prevention valve which concerns on 1st Example of this invention. (A) is a bottom view of the housing, (B) is a longitudinal sectional view of the housing. FIG. 3 is a perspective view of a main part of the fuel leakage prevention valve that is partially cut away and shown from the bottom surface side. It is a perspective view which shows a float valve. (A) is a bottom view showing a housing provided in the second embodiment, (B) is an enlarged cross-sectional view of the main part. It is principal part sectional drawing by the side of the upper small chamber part of a housing. It is a principal part expanded sectional view of the housing provided for a 3rd Example. It is explanatory drawing which shows the entering direction of a fuel. It is explanatory drawing which shows the entering direction of a fuel. It is explanatory drawing which shows the entering direction of a fuel. It is a longitudinal cross-sectional view which decomposes | disassembles and shows the conventional fuel leak prevention valve. In the conventional fuel leak prevention valve, it is a longitudinal cross-sectional view which shows the state which opened the valve seat of the housing. In the conventional fuel leak prevention valve, it is a longitudinal cross-sectional view which shows the state which obstruct | occluded the valve seat of the housing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Connector 2 Housing 3 Float valve 3a Valve part 4 Cap 5 Connection space 6 Valve seat 7 Spring 8 Flange part 9 Connection piping part 10A Upper small chamber part 10B Lower large chamber part 11 Through-hole 12A Upper small diameter part 12B Lower large diameter part 13 1st DESCRIPTION OF SYMBOLS 1 Guide wall part 14 2nd guide wall part 15 O-ring 16 Wall piece 17 Air space 18 Inner wall 19 Outer wall 20 Rib structure T Fuel tank Ta Upper wall H Mounting hole

Claims (7)

  A connector having a connection space that communicates with the outside and attached to the upper wall of the fuel tank; a housing that defines a storage space and communicates with the connection space at an upper portion; and a valve of the housing A fuel leakage prevention valve having a valve portion for opening and closing a seat and having a float valve arranged to be movable up and down in a housing space of the housing, and provided with a through hole for communicating the inside and outside of the upper wall surface of the housing A fuel leakage prevention valve characterized in that a rectangular wall piece is provided inside the housing corresponding to the through hole, and the float valve is shaped so as not to interfere with the wall piece.   2. The fuel leakage prevention valve according to claim 1, wherein the rectangular wall piece has an upper edge and one side edge integrally connected to the housing.   The housing has an upper small chamber portion having a valve seat and a lower large chamber portion continuous from the upper small chamber portion, and the float valve has an upper small diameter portion that forms a valve portion that opens and closes the valve seat of the housing; A first large guide wall portion that enters the upper small chamber portion of the housing even when the float valve descends to the upper small diameter portion of the float valve. The fuel leakage prevention valve according to claim 1, wherein the fuel leakage prevention valve is provided.   The second guide wall portion is provided in the lower large diameter portion of the float valve, and a rectangular wall piece is present between the second guide wall portion and the first guide wall portion. Fuel leak prevention valve.   3. An inner wall against which fuel that has passed through the through hole of the housing collides on an inner surface of the housing that is separated from the other side edge not connected to the housing of the rectangular wall piece. Fuel leak prevention valve.   3. The fuel according to claim 2, wherein an outer wall against which the fuel before passing through the through hole of the housing collides is provided on the outer surface of the housing on one side edge side connected to the housing of the rectangular wall piece. Leak prevention valve.   Provided on the inner surface of the housing away from the other side edge not connected to the housing of the rectangular wall piece is an inner wall against which fuel that has passed through the through hole of the housing collides, and connected to the housing of the rectangular wall piece 3. The fuel leakage prevention valve according to claim 2, wherein an outer wall against which fuel before passing through the through hole of the housing collides is provided on the outer surface of the housing on one side edge side.

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